Solution for extra line spacing in Work Log field
Applies To: SharePoint On-Premises and SharePoint Online
After writing something in the work log and hit Enter, it shows extra space between lines
If the Worklog is of type Enhanced Rich Text Field, and if we hit “Enter” in it, it takes Double Spaces.
So, rather than hitting “Enter” to move to next line, Use “Shift + Enter” so that only a single space occurs.
Refer https://support.microsoft.com/en-us/kb/2662794 for more Info.